Takeshi's childhood friend and his "girlfriend." She became a magician and gained transformation magic.

Starting in middle school, Kurumi was frequently confessed to by guys both her own age and as old as college age. At one point, she was traumatized by a particularly bad experience with a stalker, and wouldn't leave her house for a while. Takeshi agreed to protect her by pretending to be her boyfriend, and they both agreed that they would only "break-up" if either of them developed feelings for someone else.